# B

## Back-to-origin Host Header

Back-to-origin host header is a feature used to modify the Host header in HTTP requests sent from the edge server to the origin server. It allows the accelerator to send requests to the origin server using a different host header than the one originally used by the client. This can be useful in scenarios where the origin server needs to be accessed using a different hostname or IP address than the one used by the client. By modifying the Host header, the accelerator can ensure that the requests are properly routed to the origin server.

## Back-to-origin Port

Back-to-origin port is the destination port number used for sending traffic back to the origin server in a load balancing or reverse proxy scenario. When a client sends a request to a load balancer or reverse proxy, the traffic is forwarded to one of the backend servers for processing. If the backend server needs to send a response back to the client, it needs to send the traffic through the load balancer or reverse proxy to ensure that the client's original request is correctly handled.The back-to-origin port is the port number on the origin server where the traffic is sent back to. The load balancer or reverse proxy will replace the destination port number in the packet header with the back-to-origin port number, so that the traffic is correctly routed to the origin server.

## Bare Metal

Bare metal refers to a computer system or network architecture in which the operating system or application runs directly on the hardware without any intermediary software layer, such as a hypervisor or virtual machine manager. In other words, bare metal is a term used to describe a computer system that has not been configured with any software or operating system.Bare metal is often used in high-performance computing applications where the goal is to achieve maximum processing power and minimal latency. It can also be used in embedded systems, where the system is designed to perform a specific function and does not require a full-fledged operating system.Bare metal is different from virtualization, where multiple virtual machines share the same physical hardware resources. With bare metal, the operating system or application has exclusive access to the hardware, which can result in better performance and lower overhead compared to virtualized environments.

## Bandwidth

The amount of data that can be transmitted over a network in a given period of time, typically measured in bits per second (bps) or bytes per second (Bps).


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://docs.console.zenlayer.com/welcome/glossary/a-g/b.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.